Lock



Patented Nov. 28, 19221.

UNHTED fiTATES PETER IENNER, OF CHICAGO, ILLINOIS.

LOCK.

Application filed November 25, 1921. Serial No. 517,720.

provements in Locks, of which the following is a specification. I

This invention relates to improvements in locks for safe deposit boxes, but it will be understood that the invention is also applicable to other kinds of looks. I

The invention has for its object to provide a novel and improved means for reinforcing and protecting the look so that it will be practically impossible to force the lock from the outside.

The object stated 'is attained by means of a combination and arrangement of parts to be hereinafter described and claimed, and in order that the same may be better understood, reference is had to the accompanying drawing forming a part of this specification.

In the drawing,

Figure 1 is an elevation of the lock and a fragment of the closure to which it is applied; Fig. 2 is an elevation showing the parts of the lock which are inside the'lock casing; Figs. 3 and 4 are sectional views on the lines 33 and &4, respectively, of Fig. 1; Fig. 5 is an enlarged sectional view on the line 55 of Fig. 2, and Fig. 6 is an enlarged sectional view of the line 66 of Fig. 1.

Referring specifically to the drawing, 10 denotes a fragment of the door or other closure to which the lock is applied. The lock is of that type having a sliding bolt 11 and a rotatable key-cylinder 12. The tumblers which are controlled by the key and which operate, when properly set. to permit the bolt to be retracted, have not been illustrated as they form no part of the present invention. Only so much of the look as will sullice to make clear the connection of the invention therewith has been illustrated. The lock casing comprises a back 13, a top 141. a bottom 15, ends 16 and 17, and a cover plate 18. The end wall 17 is recessed to permit the bolt 11 to be protruded. The casing is secured to the closure 10 by screws 19 passing through corner recesses 20 in the cover plate 18.

For the purpose of reinforcing the lock casing, there is mounted on the outside of the back 13 a steel plate 21 which is secured by two stout screws 22 passing through said back, and also through the cover plate 18 and into the closure 10. The two screws 19 at one end of the casing also pass through the plate 21. It will therefore be seen that the plate 21 not only reinforces the lock casing, but with the screws 22 also provides additional means for fastening the casing to the closure 10, so that it cannot be easily forced away from the latter by blows from the outside.

With the bolt 11 is associated a device for preventing the same from being forced back or retracted from looking position if a burglar or other person should succeed in forcingthe key-cylinder 12 inwardly from the outside of the closure 10. This device is a pivoted detent 23 located in the lock casing alongside the bolt so that it may engage a shoulder 24 on the bottom edge of the latter, this shoulder being so located that it is opposite the end of the detent when the bolt is in advanced or locking position. It will therefore be evident that if the detent is now swung to engage the bolt shoulder, the bolt is prevented from being forced back or retracted from looking position.

The detent 23 is pivoted on one of the screws 22 and it is held away from the notch 24 by a spring 25. The key-cylinder 12 has an annular enlargement or shoulder 26 seating in an aperture 27 in the cover plate 18 of the lock casing, and the detent has one of its edges in contact with the inner face of said plate. The top of the detent has beveled surface 28 which is presented toward the shoulder 26 and inclined in such a direction that if the key-cylinder 12 should be forced inwardly in the direction of its' length, the engagement of the shoulder 26 with the surface 28 will cause the detent 23 to swing in a direction to engage the bolt shoulder 24, thereby locking the bolt 11 in advanced position. It will therefore be evident that the bolt will be held in looking position even if the key-cylinder should be forced rearwardly or back into the lock casing by a sledge hammer and punch or other means, the locking action being automatically effected by the rearward or inward movement of the key-cylinder.

A means is also associated with the bolt 11 to prevent the same from being driven away from the closure 10 and out of the lock easing. This means comprises a stud 29 carried by the bolt 11 and projecting from the side thereof which faces the plate 18. The outer end of the stud 29 has a head 30 which seats in a slot 3L in the door 10 and is free to slide therein so as not to interfere with the proper operation of the bolt ll. The slot 31 is undercut and therefore holds the head 30 against being forced out of the same, With the result that the bolt 11 cannot be driven rearwardly away from the door 10 and out of the lock casing by blows against the outside of the door. The plate 18 has a slot 32 through which the stud 29 extends.

The devices hereinbefore described are very simple and highly eflicient for the purpose set forth, and they can be readily applied to any ordinary lock of the type shown and Without regard to the parts to which the lock may be applied.

I claim:

1. The combination in a lock, of a bolt, a rotatable key-cylinder, a casing carrying said bolt and cylinder, and a detent adapted to lock the ,bolt in advanced position and normally in inoperative position, said detent being positioned to intercept the key-cylinder upon a forced movement thereof inwardly of the casing, and having a beveled surface engageable by the key-cylinder upon such movement, such engagement of the keycylinder with the beveled surface placing the detent in operative position.

2. The combination in a lock, of a bolt, a rotatable key-cylinder, a casing carrying said bolt and cylinder, and a pivoted detent adapted to lock the bolt in advanced position and normally in inoperative position, said detent being positioned to intercept the keycylinder upon a forced movement thereof inwardly of the casing, and having a beveled surface engageable by the key-cylinder upon such movement, such engagement of the keycylinder with the beveled surface swinging the detent to operative position.

3. The combination With a closure and a lock therefor comprising a bolt and a casing carrying the bolt; of a beaded stud projecting from the bolt, the closure having a slot in Which the head of the stud slidably seats, said slot having means for holding the head against Withdrawal.

4. The combination with a closure and a lock therefor comprising a bolt and a casing carrying the bolt; of a beaded stud projecting from the bolt, the closure having an undercut slot in Which the head of the stud slidably seats.

In testimony whereof I affix my signature.

PETER PENNER. 

